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                <li class="active"><a href="#">综述</a></li>
                <li><a href="#">简述</a></li>
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                        <li><a href="#tab-chrome">Chrome</a></li>
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        <div class="item active">
            <img src="img/chrome-big.jpg" alt="chrome">
            <div class="carousel-caption">
                <h1>Chrome</h1>
                <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
                <p><a class="btn btn-lg btn-primary" href="http://www.google.cn/intl/zh-CN/chrome/browser/"
                      role="button" target="_blank">点我下载</a></p>
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        <div class="item">
            <img src="img/firefox-big.jpg" alt="firefox">
            <div class="carousel-caption">
                <h1>Firefox</h1>
                <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
                <p><a class="btn btn-lg btn-primary" href="http://www.firefox.com.cn/download/" target="_blank"
                      role="button">点我下载</a></p>
            </div>
        </div>
        <div class="item">
            <img src="img/safari-big.jpg" alt="safari">
            <div class="carousel-caption">
                <h1>Safari</h1>
                <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                <p><a class="btn btn-lg btn-primary" href="http://www.apple.com/cn/safari/" target="_blank"
                      role="button">点我下载</a></p>
            </div>
        </div>
        <div class="item">
            <img src="img/opera-big.jpg" alt="opera">
            <div class="carousel-caption">
                <h1>Opera</h1>
                <p>Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。</p>
                <p><a class="btn btn-lg btn-primary" href="http://www.opera.com/zh-cn" target="_blank" role="button">点我下载</a>
                </p>
            </div>
        </div>
        <div class="item">
            <img src="img/ie-big.jpg" alt="ie">
            <div class="carousel-caption">
                <h1>IE</h1>
                <p>Internet Explorer，简称 IE，是微软公司推出的一款网页浏览器。</p>
                <p><a class="btn btn-lg btn-primary" href="http://ie.microsoft.com/" target="_blank"
                      role="button">点我下载</a></p>
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    <div class="row text-center">
        <div class="col-md-4">
            <img class="img-circle" src="img/chrome-logo-small.jpg" alt="chrome">
            <h2>Chrome</h2>
            <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
            <p><a class="btn btn-default" href="#" role="button">点我下载</a></p>
        </div>
        <div class="col-md-4">
            <img class="img-circle" src="img/firefox-logo-small.jpg" alt="firefox">
            <h2>Firefox</h2>
            <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
            <p><a class="btn btn-default" href="#" role="button">点我下载</a></p>
        </div>
        <div class="col-md-4">
            <img class="img-circle" src="img/safari-logo-small.jpg" alt="safari">
            <h2>Safari</h2>
            <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
            <p><a class="btn btn-default" href="#" role="button">点我下载</a></p>
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        <!-- Nav tabs -->
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            <li class="active"><a href="#tab-chrome" role="tab" data-toggle="tab">Chrome</a></li>
            <li><a href="#tab-firefox" role="tab" data-toggle="tab">Firefox</a></li>
            <li><a href="#tab-safari" role="tab" data-toggle="tab">Safari</a></li>
            <li><a href="#tab-opera" role="tab" data-toggle="tab">Opera</a></li>
            <li><a href="#tab-ie" role="tab" data-toggle="tab">IE</a></li>
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        <!-- Tab panes -->
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            <div class="tab-pane active" id="tab-chrome">
                <div class="row feature">
                    <div class="col-md-7">
                        <h2 class="feature-heading">Google Chrome <span class="text-muted">使用最广的浏览器</span></h2>
                        <p class="lead">Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。
                            该浏览器是基于其他开源软件所撰写，包括WebKit，目标是提升稳定性、速度和安全性，并创造出简单且有效率的使用者界面。</p>
                    </div>
                    <div class="col-md-5">
                        <img class="feature-image img-responsive" src="img/chrome-logo.jpg" alt="Chrome">
                    </div>
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            <div class="tab-pane" id="tab-firefox">
                <div class="row feature">
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                        <img class="feature-image img-responsive" src="img/firefox-logo.jpg" alt="Firefox">
                    </div>
                    <div class="col-md-7">
                        <h2 class="feature-heading">Mozilla Firefox <span class="text-muted">美丽的狐狸</span></h2>
                        <p class="lead">Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器，
                            使用Gecko引擎（非ie内核），支持多种操作系统如Windows、Mac和linux。</p>
                    </div>
                </div>
            </div>
            <div class="tab-pane" id="tab-safari">
                <div class="row feature">
                    <div class="col-md-7">
                        <h2 class="feature-heading">Safari <span class="text-muted">Mac用户首选</span></h2>
                        <p class="lead">Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器，使用了KDE的KHTML作为浏览器的运算核心。
                            Safari在2003年1月7日首度发行测试版，并成为Mac OS X v10.3与之后的默认浏览器，也是iPhone与IPAD和iPod touch的指定浏览器。</p>
                    </div>
                    <div class="col-md-5">
                        <img class="feature-image img-responsive" src="img/safari-logo.jpg" alt="Safari">
                    </div>
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                    <div class="col-md-5">
                        <img class="feature-image img-responsive" src="img/opera-logo.jpg" alt="Opera">
                    </div>
                    <div class="col-md-7">
                        <h2 class="feature-heading">Opera <span class="text-muted">小众但易用</span></h2>
                        <p class="lead">Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。
                            是跨平台浏览器可以在Windows、Mac和Linux三个操作系统平台上运行。.</p>
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                </div>
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            <div class="tab-pane" id="tab-ie">
                <div class="row feature">
                    <div class="col-md-7">
                        <h2 class="feature-heading">IE <span class="text-muted">你懂的</span></h2>
                        <p class="lead">Internet Explorer，原称Microsoft Internet Explorer(6版本以前)和Windows Internet
                            Explorer(7，8，9，10版本)， 简称IE，是美国微软公司推出的一款网页浏览器。它采用的排版引擎(俗称内核)为Trident。</p>
                    </div>
                    <div class="col-md-5">
                        <img class="feature-image img-responsive" src="img/ie-logo.jpg" alt="IE">
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